Level and decay scheme studies in /sup 92/Zr and /sup 94/Zr via (n,n'. gamma. ) reactions
Measurements of (n,n'..gamma..) excitation functions were made for incident neutron energies from 2.2 to 3.7 MeV. For /sup 92/Zr, 51 transitions from 26 levels through 3472.0 keV excitation energy were observed. The /sup 94/Zr study of 20 levels through 3361.2 keV excitation energy produced 28 observed ..gamma.. rays, 12 of which were previously unidentified. Angular distributions were measured at 3.2 and 3.7 MeV bombarding energies for 24 and 39 transitions respectively in /sup 92/Zr and at 3.1 MeV for 18 transitions in /sup 94/Zr. Two new levels were discovered in /sup 92/Zr at 2903.8 and 3407.9 keV. A previously reported ambiguity involving 2/sup +/ and 4/sup +/ levels in /sup 94/Zr has been resolved, revealing a 4/sup +/ level at 2329.0 keV and a 2/sup +/ level at 2365.4 keV. New levels were found in this isotope at 2507.6, 2698.0, 2825.2, and 2859.8 keV. Six unique spin or spin-parity assignments, based only on the present work, were made in /sup 92/Zr(E/sub x/ in keV, J/sup ..pi../): 2339.0, 3; 2485.1, 5; 2742.6, 4; 2903.8, 0; 3056.5, 2; 3370.9, 1; and three in /sup 94/Zr: 2365.4, 2; 2507.6, 3; 2603.7, (5). A 4/sup -/, 5/sup -/ excited proton doublet appears to have been found in each of the isotopes at excitation energies comparable to those for the doublet in /sup 90/Zr. This suggests similar proton configurations for all three isotopes. Neutron inelastic scattering cross sections are in agreement with those from experiments employing neutron detection.
- Research Organization:
- Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506
- OSTI ID:
- 6505396
- Journal Information:
- Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 18:6; ISSN PRVCA
- Country of Publication:
- United States
- Language:
- English
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Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
BARYON REACTIONS
BRANCHING RATIO
CROSS SECTIONS
DISTRIBUTION
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EXCITATION FUNCTIONS
GAMMA SPECTRA
HADRON REACTIONS
INELASTIC SCATTERING
INTERMEDIATE MASS NUCLEI
ISOTOPES
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 01-10
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
PARITY
PARTICLE PROPERTIES
SCATTERING
SPECTRA
SPIN
STABLE ISOTOPES
STATISTICAL MODELS
TARGETS
ZIRCONIUM 92
ZIRCONIUM 92 TARGET
ZIRCONIUM 94
ZIRCONIUM 94 TARGET
ZIRCONIUM ISOTOPES